Question

HELP PLEASE:How much work is done to increase the speed of a 2kg body from 36km / h to 72km / h?​

Answer 1

100 joules (J).

Step-by-step explanation:

Converting Units - 36 km/h = 10 m/s

72 km/h = 20 m/s ( 1 km/h = 5/18 m/s)

Change in speed = 20 - 10 = 10 m/s

Applying the Work-Energy theorem,

`Work done = (1)/(2) 2 (10)^2`

= 100 J.